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Tug test

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tug test clinical examination shoulder instability

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tug test medicine clinical examination what is it used for

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The query "tug test" is ambiguous - it could refer to two different clinical tests. Since both are well-supported in the textbooks, here is a comprehensive answer covering both:

The "Tug Test" in Medicine

The term "tug test" in clinical medicine most commonly refers to one of two things:

1. Timed Up and Go (TUG) Test - Mobility & Fall Risk

The most widely recognized "TUG test" in clinical medicine.

What it is

A simple, quick performance-based measure of lower extremity function, mobility, and fall risk.

How to perform it

  1. Patient sits in a standard armchair
  2. On a start signal, patient stands up (without using arms for assistance)
  3. Walks 3 meters (or 10 feet) forward to a marker
  4. Turns around
  5. Walks back and sits down in the chair

Interpretation

TimeInterpretation
< 12 secondsNormal mobility
> 12 secondsHigh fall risk - warrants further assessment
> 13.5-14 secondsProne to falls

Clinical uses

  • Fall risk screening in community-dwelling older adults (recommended by CDC's STEADI initiative, American Geriatrics Society, British Geriatrics Society)
  • Assessing mobility in Parkinson's disease, post-stroke, orthopedic conditions, vestibular disorders, amyotrophic lateral sclerosis
  • Monitoring osteoarthritis of hip and knee (validated for patients awaiting joint replacement)
  • Pre-operative frailty assessment in surgical patients
  • Geriatric assessment - often combined with Berg Balance Scale and Dynamic Gait Index

Key features

  • Requires no special equipment
  • Inter-rater reliability ICC = 0.99; intra-rater reliability ICC = 0.99
  • Should NOT be used in isolation - always combined with multifactorial assessment
  • May be less reliable in patients with cognitive impairment
  • Harrison's Principles of Internal Medicine 22E, Assessment of Falls
  • Rheumatology, 2-Volume Set (Elsevier 2022), Performance-Based Assessment

2. Hair Pull Test (Hair "Tug" Test) - Dermatology

Sometimes colloquially called the "tug test," this is the hair pull test (Sabouraud maneuver) used to assess hair shedding disorders.

How to perform it

  1. Patient should not have shampooed for >24 hours before the test
  2. Grasp approximately 40-60 hairs between thumb and index finger
  3. Pull firmly along the hair shafts
  4. Repeat in at least 3 scalp areas: frontal, occipital, and temporal regions

Interpretation

  • Positive (abnormal): >10% of tested hairs collected = active hair shedding
  • Clinically: >5-6 hairs consistently pulled from 2 or more areas suggests increased hair loss
  • Morphology of roots matters:
    • Telogen club hairs (intact bulb): telogen effluvium
    • Tapered "pencil point" hairs: suggests alopecia areata

Clinical uses

  • Telogen effluvium (diffusely positive)
  • Alopecia areata (strongly positive, especially at margins of patches)
  • General hair loss disorders

Important caveat

A negative hair pull does NOT exclude telogen effluvium.
  • Fitzpatrick's Dermatology, Hair Pull Test section

Which "Tug Test" Were You Asking About?

If you meant something different - such as a shoulder instability tug test, an obstetric/fetal scalp test, or a different orthopedic exam - let me know and I'll focus the answer accordingly.

Time up and go test

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Here is a complete, textbook-grounded overview of the Timed Up and Go (TUG) Test:

Timed Up and Go (TUG) Test

Also called: Timed Get Up and Go test Developed by: Podsiadlo and Richardson (1991)

Purpose

The TUG test is a simple, quick, reliable, and well-validated performance-based clinical tool that assesses:
  • Functional mobility (sit-to-stand, walking, turning, sitting)
  • Dynamic balance
  • Fall risk in older adults
  • Gait and coordination
  • Functional independence
It measures multiple complex components in a single maneuver: the ability to follow directions, quadriceps strength, gait, balance, and coordination.

How to Perform

Equipment needed

  • Standard hard-backed chair with armrests
  • A measured 3-meter (10-foot) walkway
  • A stopwatch

Procedure

  1. Patient sits in the chair (hard-backed, with arms)
  2. Patient may use their normal assistive device (cane, walker) if they routinely use one
  3. On the examiner's signal: patient stands up from the chair (without using arms if possible)
  4. Walks 3 meters (10 feet) forward at a comfortable pace
  5. Turns around at the marker
  6. Walks back to the chair
  7. Sits back down
  8. The examiner records the total time in seconds

Scoring / Interpretation

Time (seconds)Interpretation
< 10 secondsNormal - no mobility impairment
10-20 secondsGood mobility; mostly independent; frail but mobile older adults
> 20 secondsHigher level of mobility dependence
> 12 secondsHigh fall risk - further assessment warranted (Harrison's)
> 13.5-14 secondsAssociated with poor health outcomes (Rheumatology)
> 11 secondsIncreased fall risk in vestibular disorder population
Cannot completeSignificant dependence for mobility
Note: The cut-off varies slightly by textbook and the patient population being assessed. The TUG score is age-dependent.

Clinical Applications

SettingUse
GeriatricsFall risk screening (community-dwelling older adults)
OrthopedicsFunctional outcome after hip/knee arthroplasty and hip fracture
RheumatologyFunctional assessment in osteoarthritis (OA) of hip and knee - endorsed by OARSI as a core outcome measure
UrologyAssessment of "functional" urinary incontinence linked to mobility impairment
NeurologyParkinson's disease (both "on" and "off" medication), post-stroke, ALS
VestibularBalance and fall risk in vestibular disorder patients
Surgery/FrailtyPre-operative frailty screening alongside Comprehensive Geriatric Assessment (CGA)
OtolaryngologyVestibular rehabilitation outcome measure

What the TUG Actually Measures

Despite its simplicity, the test assesses several interacting systems:
  • Muscle strength - particularly quadriceps for sit-to-stand
  • Gait - speed, cadence, step length
  • Balance - both static and dynamic
  • Coordination and ability to change direction
  • Cognition - ability to follow instructions
  • Cardiovascular reserve - in frail patients

Comparison with Related Tests

TestWhat it Adds
Berg Balance ScaleMore detailed balance assessment; may have ceiling effects in healthy older adults
Dynamic Gait Index (DGI)Scores <19/24 correlate with falls; incorporates head turns
Functional Gait Assessment (FGA)Score ≤22/30 = 100% sensitivity for predicting falls
Short Physical Performance Battery (SPPB)Adds 4-meter walk + chair stand test; score <10 predicts falls
Gait Speed (10-m walk)Gait speed <0.6 m/s = increased risk of poor outcomes; >1.0 m/s = healthier aging

Important Caveats

  • Do NOT use TUG in isolation for fall risk - always combine with multifactorial assessment
  • Less reliable in patients with cognitive impairment
  • Results are age- and sex-dependent - interpret against normative data
  • If the patient uses an assistive device, document it, as this affects the score
Sources:
  • Campbell Walsh Wein Urology, Mobility section
  • Firestein & Kelley's Textbook of Rheumatology, Function assessment
  • Harrison's Principles of Internal Medicine 22E, Assessment of Falls
  • Cummings Otolaryngology, Functional Performance Outcome Measures
  • Rockwood and Green's Fractures in Adults 10E, Outcome Measures for Femoral Neck Fractures
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